/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Returns the triangles associated with the given polygon group
[TArrayView](API\Runtime\Core\Containers\TArrayView)< const [FTriangleID](API\Runtime\MeshDescription\FTriangleID) > GetPolygonGroupTriangles ( const [FPolygonGroupID](API\Runtime\MeshDescription\FPolygonGroupID) PolygonGroupID ) const